@andstatus nginx has nothing to do with this. It is just one out of several webservers in a very varied eco system. I am using lighttpd instead on #, Apache with mod_fastcgi is used on # # works because it is does not use CGI.
I do not have any experience whatsoever with Java development, so I have no motivation to setup a debug environment and build # with completely unexperienced code editing.

This question remains: Have you tried sending the Content-Length header to the servers (#, #) which are returning "411 Length required"?: